Question: When was julian Huxley as chairperson of the United Nations Educational, Scientific and Cultural Organization?
Paraphrase: When did Julian Huxley Chari the United Nations Educational, Scientific, and Cultural Organization?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q7809 p:P488 ?s . ?s ps:P488 wd:Q243419 . ?s pq:P580 ?value}